Chuck



A. E. HOOK.

cHucK.

APPLICATION FILED OCT. 27. |919.

Patented Nov. 23, 1920.

N m I QN WN ww QN, Q m m w l m N k I l l QN W2 Q I INVENToR. lxalderfffk I BY Q ATTORNEY HMS UNITED4 STATES 'PATENT OFF-lcs.' r

ALEXANDER E. HOOK, or srocK'rON, cALfrronNIA, AssIGNoR or ONE-HALF WAYMANW. s'rnnn, or srocK'roN, oALIroaNIA.` j

Toy

CHUCK,v

To all whom it may concern.'

Be itknown that I, ALEXANDER E. HOOK, a citizen of the United States, residing at Stockton, county of SanJoaquin, Stateof California', have inventedcertain.l new and useful Improvements in Chucks; and I doV declare the following to be a full, clear, and

exact description of the same, reference V 'bei -2-,2 of Figfl) ing had to the accompanying drawings, and to the characters of` reference marked thereon, which form a part of this application.

This invention relates to improvements in.,

chucks, and particularly to a type especially intended and adapted to hold piston rings in order to face the same, the principal object of the invention being to provide a chuck by means of which piston rings of any diameter may be securely held without danger of warping the same by so doing.

VAnother object is to produce a chuck for the purpose specified by the use of which the time necessary to place a ring in Vposition for the facing tool will be cutjdown to practically nothing.

In the manufacture of piston rings, a cylinder or tube is first finished to the correct diameter, and the rings of approximately the correct width cut therefrom. A In the casting of the ring-cylinder, certain cooling strains are developed in the metal,

the effects of which do not show till each f thin ring is cut therefrom, when Veach ring is apt to be somewhat warped on its face.

The strength of the magnetic chuck usually used is such however that while the ringis held thereagainst the warp is temporarily Y straightened out of the ring, and when-the same is faced off apparently true, and then removed from the chuck, the warp of course is still present and thus a true and accurate job cannot be done. Y

With my form of chuck, this objectionable feature is eliminated,rand the ring is held in a perfectly natural position, so that any warp will be cut therefrom, and the resulting Yfinishedproduct will be perfectly accurate and flat. Y

A further obj ect of the invention is to produce a simple and inexpensive device, and yet one which will be exceedingly effective for the purposes for which it is designed.

These Objects I accomplish by means of such structure and relative arrangement of vSpecification of Letters Iatent, I Patn'ted NO V. 23,' `19,20. Applicationled October 27,' 1919. Serial` No. 333,446. Y v

the following specification and claim.v

Inl-the drawings similar charactersv of reference indicate corresponding parts; in

.the several views.

Figure l is a `front elevation -of improved chuck.

llig..2 is aV crosssection taken on a line Referring -novx7V more particularly'v to the characters of reference on the drawings, the numeral 1 denotes the face plate of the chuck, finished smooth on its front side, and provided with a removable flange-coupling 2 ,parts as willfully appear by-a perusal of-l on the rear end thereof and secured to the with a plurality of radially drilled pockets 5 in which are slidably mounted plungers 6,

which arenormally forced toward the center Y of therpl'ate by reason ofsprings 7 therein Y bearing against caps 8 screwed into the outer ends of the pockets.

Ring holding jaw members 9 are secured to the plungers, being of hardened steel, and

projecting' beyond the finished face of' the plate, being slidable in slots 10 which areY Y* jaw/is provided with a plurality of transcut from the pocketsto the saidjface. Each verse and straight edged grooves 11 having a width somewhat greater than the thicknessv of standard piston rings. rI'hese grooves of course leave lugsy l1a projecting from the jaws.' `The inner ends of the jaws, lthat is, the

Yends nearest the center of the plate l, are

beveledv away from said plate as at 12, and

normally project into a circularchamber 13 provided centrally of the plate. i e

Screwed into vthe back of the face plate centrally thereof is a threaded pin 14 projecting a certain distance beyond they face .Y

of the plate. l

On this pin is a handle member 15 having a beveled portion 16 on its inner end adapted to bear against the beveled edges 12y of the jaws to force the same outwardly.

In the operation of the chuck, the ring is y. Y

held by the Outer faces of corresponding Ones of the lugs 11a, which, being straightedged, bite at two points against the inner surface of the ring being held.

The back of the ring rests against the aceof the plate l, since the grooves are cut deeper than the said face. The ring is held by tightening up of the handle l5. Y

It is evident that the range of diameters of rings the chuck may hold is limitless within reasonable bounds, since the number or' lugs or grooves and the fact that the jaws have a reasonable range of radial movement, makes it possible to hold a ring of any diameter between the largest and smallest it is adapted to take.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfils the object of the invention as set forth herein.

While this speciiication sets forth indetail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure fromthe spirit therein for simultaneous radial movement, such Jaws comprising radial portions sunk v below the level of the face platel and a plus rality of lugs or equal height projecting at spaced intervals from said radial portions and adapted vto engage the periphery of a ring, such lugs terminating short of the outer faceoi'the ring. Y 4

In testimony whereof I ax ture in presence of -two witnesses.

Y ALEXANDER E. HOOK.

. Witnesses: e Y

BERNARD PRIVAT, i FRANK H.' CARTER. 

